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92 Ford F 150 diagnosing air leak in air intake somewhere how to diagnose where with smoke

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I doubt smoke will help however the judicious use of a directed stream of flammable solvent (WD-40, Carb cleaner, starting fluid, etc.) or gas (propane, MAPP gas, etc.) will result in an increase in rpm when the leak is covered. Smoke is very useful when it blows OUT but hard to see when it is sucked in! Work outdoors and keep a fire extinguisher handy.

Posted on Mar 05, 2016

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SOURCE: 1990 Honda Civic Hatchback, 1.5 EFI, runs great

Did you put Valve seals in the head???
Other than that the PCV is a good start...
But it sounds like the oil rings on the pistons to me.

Posted on Apr 19, 2009

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SOURCE: Code number PO100- air flow sensor, volume airflow

Those sensors are actually connected to your air intake pipe just after your air filter. They're just plug and play sensors.

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leaky fuel injectors or a bad fuel pressure regulator could be the cause. check the fuel pressure. should be 3.0 to 3.5 bar.

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Hi, Ford Escort stalling

The behaviour you describe is called "hunting"; it's typical of an engine with an over-lean fuel:air mixture.

Check the inlet manifolds as there is an air leak somewhere; typically it's a loose joint, faulty gasket, or a cracked or corroded manifold, do not expect to be able to see any cracks with the naked eye as they are usually barely perceptible hairline fractures.

The brakes are servo assisted and use the lower pressure air in the inlet manifold of the engine when running, so when you use the brakes it puts an additional load on the inlet manifold and forces any intake leaks to allow even more air into the system. This will cause the fuel:air mixture to become far too weak to sustain combustion and the engine will stall.

You'll save yourself a lot of time and headaches if you get the car to a garage which will be able to quickly and accurately diagnose the fault for you. Then you can choose whether to have them make repairs or to do so yourself; if you choose the DIY option then the garage will reasonably expect a payment for the work done to diagnose the fault.

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